Do you know the properties and uses of stearic acid (octadecanoic acid) found in almost all oils and fats?

Stearic acid, alias: stearic acid|octadecanoic acid| Fatty wax. is a fatty acid widely present in nature. Stearic acid is found in varying amounts in almost all fats and oils, and is found in higher amounts in animal fats, such as butter. Up to 24%, the content in vegetable oil is less, tea oil is 0.8%, palm oil is 6%, but the content in cocoa butter is as high as 34%. According to the supply of stearic acid, there are two main production methods of industrial stearic acid: fractionation method and pressing method. A decomposing agent is added to the hardened oil, and then it is hydrolyzed to obtain crude fatty acids, which are then washed, distilled, and decolorized to obtain the finished product, while glycerol is produced as a by-product.

1. Physical properties

1. Properties: white waxy transparent solid or slightly yellow waxy solid. Can be dispersed into powder with slight butter smell.

2. Relative density (g/mL, 20/4℃): 0.9408

3. Relative vapor density (g/mL, air=1): Undetermined

4. Melting point (oC): 67~69

5 Boiling point (oC, normal pressure): 183~184 (133.3pa)

6. Boiling point (oC, 5.2kPa): 360

7. Refractive index (n20D): 1.455

8. Flash point (oC): >110

9, solubility: Insoluble in water, slightly soluble in cold ethanol, and easier to dissolve when heated. Slightly soluble in acetone and benzene, easily soluble in ether, chloroform, hot ethanol, carbon tetrachloride and carbon disulfide.

2. Purpose

1. Agricultural chemicals, food, crayons, candles, cement, coatings, inks, leather waxes, lubricants, metal processing, mining, pencils, capsules and ointments, plastics, tire rubber, textiles, paper and other industries.

2. Used to produce stearates; including sodium stearate, magnesium stearate, calcium stearate, lead stearate, aluminum stearate, cadmium stearate, stearate Iron acid, potassium stearate.

3. In the cosmetics industry, it is an indispensable raw material for the manufacture of general emulsified products. It is used to prepare ice cream, cold cream, foundation cream, shaving cream, hair lotion and skin care lotion, etc. Among them, it plays an emulsifying role in two types of skin care products: snow cream and cold cream, turning it into a stable and white paste.

4. Used as vulcanization activator (rubber vulcanizing agent) for natural rubber, synthetic rubber (except butyl rubber) and latex.

5. Used as cold-resistant plasticizer, PVC stabilizer and lubricant for plastics.

6. Used in medicine to prepare ointments, suppositories, etc.

7. This product is used as a raw material for lubricants, defoaming agents and food additives in the food industry.

8. It is also widely used as papermaking aids, release agents, polishing agents, metal mineral flotation agents, solvents for oil-soluble pigments, crayon smoothing agents, wax paper polishing agents, emulsifiers, etc.

3. Storage method:

1. Type 200 stearic acid is packed in cardboard boxes. Type 800 stearic acid is packed in woven bags lined with plastic bags. Store in a cool and ventilated place.

2. This product can be packed in cardboard boxes or woven bags lined with plastic bags. The net weight of each box (bag) is 25kg or 50kg.

3. Store in a cool, dry and ventilated place, keep away from sources of fire and oxidants. Store and transport according to general chemical regulations